Component
Proposed human CTNS D346 protonation switch
Context-specific entity; species, compartment and exposure are stated on each claim.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What it acts on
D346N substitution abolished the pH-dependent conformational switch; the authors proposed D346 as a key protonation site controlling human cystinosin transitions.
Experimental context and source evidence
- evidence_access
- Primary full text
- experimental_model
- Human CTNS mutagenesis and double electron–electron resonance spectroscopy at pH 5.2 and 7.4.
- limitations
- A structure-supported protonation model is not a demonstrated effect of changing dietary acid or mineral intake.
- nutrient_topic
- L-Cysteine collection; species, compartment, exposure, co-substrates and manipulation remain explicit. · L-Cysteine
- plain_language
- The transporter couples substrate movement to an acidic compartment.
- primary_references
- Structure and mechanism of human cystine exporter cystinosin. · 2022 · https://pubmed.ncbi.nlm.nih.gov/36113465/ · DOI 10.1016/j.cell.2022.08.020
L-Cysteine: sulfur allocation, redox supply and cross-nutrient mechanisms (2026-09-19) · lines 44–50
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human CTNS mutagenesis and double electron–electron resonance spectroscopy at pH 5.2 and 7.4. · source_derived_draft · unverified_draft
## l-cysteine-ctns-proton-switch The transporter couples substrate movement to an acidic compartment. D346N substitution abolished the pH-dependent conformational switch; the authors proposed D346 as a key protonation site controlling human cystinosin transitions. Model: Human CTNS mutagenesis and double electron–electron resonance spectroscopy at pH 5.2 and 7.4. Limitations: A structure-supported protonation model is not a demonstrated effect of changing dietary acid or mineral intake. Evidence access: Primary full text Structure and mechanism of human cystine exporter cystinosin. · 2022 · https://pubmed.ncbi.nlm.nih.gov/36113465/ · DOI 10.1016/j.cell.2022.08.020
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.